Table 6. S. japonicum prevalence in snail in the 16 villages from 2005 to 2012.

Year	No. snails dissected	Density of living snails(No./0.11 m2)	No. infected snails	Infected snail habitat (hm2)	Density of infected snails (No./0.11 m2)	Prevalence (95% CI)
2005	46978	0.85	138	58.95	0.0025	0.29% (0.24, 0.34)
2006	35328	0.67	60	64.72	0.0011	0.17% (0.13, 0.21)
2007	22386	0.44	38	35.78	0.0008	0.17% (0.12, 0.22)
2008	14601	0.28	33	27.71	0.0006	0.23% (0.15, 0.30)
2009	15824	0.29	22	18.08	0.0004	0.14% (0.08, 0.20)
2010	16914	0.32	10	4.07	0.0002	0.06% (0.02, 0.10)
2011	13927	0.19	3	1.13	0.00004	0.02% (0.00, 0.05)
2012	15010	0.20	0	0	0	0